The utility model provides a double -balloon system and sightseeing captive balloon relates to the machine -building field. This double -balloon system includes outer gasbag and interior gasbag, and interior gasbag sets up in outer gasbag, and the helium is packed to outer gasbag, and the air is packed to interior gasbag. This double -balloon system still includes the connecting piece, outer gasbag includes end to end's a plurality of first cut -parts, a plurality of first cut -parts end to end form the spheroid, interior gasbag includes a plurality of third cut -parts of second cut -parts and end to end, link to each other with the second cut -parts behind a plurality of third cut -parts end to end, the second cut -parts were kept away from to the cross -section radius of gasbag along the third cut -parts in should one end is crescent to the orientation of the one end be connected with the second cut -parts, this connecting piece is connected with one end and first cut -parts that third cut -parts and second cut -parts are connected respectively along the circumference of second cut -parts. The embodiment of the utility model provides a double -balloon system and sightseeing captive balloon can the intracapsular pressure of automatically regulated gas, and resources are saved keeps the gasbag appearance, makes the gasbag more firm simultaneously.